Oklahoma Population by County, 2025 Census Estimates
Oklahoma population by county: July 2025 Census estimates for all 77 counties, change since 2020, density, and a link to each official parcel map.
Looking for Oklahoma population by county? The Census Bureau estimates that Oklahoma had 4,123,288 residents on July 1, 2025, spread across 77 counties. Oklahoma County is the most populous, with 822,125 people (20% of the state), and Cimarron County is the least populous, with 2,059.
The table below lists every county with its 2025 estimate, its April 2020 starting point, the change, people per square mile, and a link to its official parcel viewer.
Percent change runs from the April 1, 2020 estimates base to July 1, 2025. People per square mile is the July 2025 estimate divided by the county's land area in the Census Bureau's 2020 Gazetteer file, so lakes and bays are left out.
How Oklahoma's population is spread out
Grouping the counties by size shows how concentrated the state is:
Residents (July 2025)
Counties
Total residents
Share of state
250,000 to 999,999
3
1,824,880
44%
100,000 to 249,999
3
411,544
10%
25,000 to 99,999
29
1,427,655
35%
10,000 to 24,999
22
345,680
8%
Under 10,000
20
113,529
3%
3 counties with at least 250,000 residents hold 44% of the state's population.
Most and least densely populated
The most crowded counties by people per square mile of land:
Tulsa County: 1,225 per sq mi (698,782 people on 570 sq mi)
Oklahoma County: 1,160 per sq mi (822,125 people on 709 sq mi)
Cleveland County: 564 per sq mi (303,973 people on 539 sq mi)
Canadian County: 209 per sq mi (187,189 people on 897 sq mi)
Wagoner County: 166 per sq mi (93,263 people on 562 sq mi)
The most thinly settled:
Cimarron County: 1.1 per sq mi (2,059 people on 1,835 sq mi)
Beaver County: 2.7 per sq mi (4,882 people on 1,815 sq mi)
Roger Mills County: 2.9 per sq mi (3,259 people on 1,141 sq mi)
Ellis County: 2.9 per sq mi (3,613 people on 1,231 sq mi)
Harper County: 3.1 per sq mi (3,172 people on 1,039 sq mi)
About these numbers
They are estimates. Between censuses the Census Bureau's Population Estimates Program updates county totals each year from births, deaths and migration records. The next full count is the 2030 census.
The base is April 1, 2020. The estimates start from an April 1, 2020 "estimates base" built from the 2020 census, which is why it is slightly different from the published census count.
Each new release revises the past. A newer vintage can change earlier years as well, so compare numbers from the same release, as this page does.
Statewide total. The counties add up exactly to the statewide figure of 4,123,288 in the same file.
Using population numbers in a land search
Big counties, busy offices. In the most populous counties, parcel maps and deed records are usually online and searchable, but recording and permit offices are busier. Allow for that if you are on a deadline.
Small counties, fewer sales. In counties with only a few thousand people, land changes hands less often, so there are fewer recent sales to compare a price with. Recorded deeds and the local assessor's sales records are the best source.
Density hints at lot size. A low people-per-square-mile figure usually means farms, ranches and timber tracts; a high one means subdivided lots. The parcel viewer shows the actual parcel lines.
Check the official map. Use the parcel viewer link in the table for boundaries, parcel numbers and owner names, then confirm anything important with the local assessor and the office that records deeds.